Radius of Investigation for Flow Time
Radius of investigation is used in reservoir engineering and well testing that estimates the maximum radial distance from a wellbore where a pressure disturbance from production or injection has been detected over a given flow time. It is commonly used to understand the extent of the reservoir affected by the operation within a certain time frame.
Radius of Investigation for Flow Time Formula |
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| \( r_i \;=\; \left( k \cdot \dfrac{ t }{ 948 \cdot n \cdot \eta \cdot \beta } \right)^{0.5} \) | ||
| Symbol | English | Metric |
| \( r_i \) = Radius of Investigation at the End of Injection Time |
- | \(m\) |
| \( k \) (Greek symbol rho) = Permability | - | \(mD\) |
| \( t \) = Time | - | \(h\) |
| \( n \) = Porosity | - | \(dimensionless\) |
| \( \eta \) (Greek symbol eta) = Oil Viscosity | - | \(cP\) |
| \( \beta \) (Greek symbol beta) = Total Compressibility (1/psi) | - | \(Pa\) |
